A massive explosion has rocked Lebanon's capital Beirut, killing at least 78 people, injuring almost 4,000, flattening much of the port, and sending a shock wave that damaged buildings across the city. Prime Minister Scott Morrison said one Australian had been killed and Australia's embassy had been "impacted significantly" in the explosion. "We can report all of the staff there are well, but the building that the embassy is in has been significantly compromised. I'm pleased that apart from some cuts and scratches, our staff are all OK," he said. The explosion...